在字符串数组中查找公共字符串(ruby) [英] Finding common string in array of strings (ruby)

问题描述

假设我有一个包含 3 个字符串的数组:

Given I have an array of 3 strings:

["Extra tv in bedroom",
 "Extra tv in living room",
 "Extra tv outside the shop"]

如何找到所有字符串共有的最长字符串?

How do I find the longest string all strings have in common?

推荐答案

这里有一个红宝石般的方法.但是，如果您有一堆字符串或它们很长，则应该使用更高级的算法:

Here's a rubyish way of doing it. You should use a more advanced algorithm if you have a bunch of strings or they are very long, though:

def longest_common_substr(strings)
  shortest = strings.min_by &:length
  maxlen = shortest.length
  maxlen.downto(0) do |len|
    0.upto(maxlen - len) do |start|
      substr = shortest[start,len]
      return substr if strings.all?{|str| str.include? substr }
    end
  end
end

puts longest_common_substr(["Extra tv in bedroom",
                            "Extra tv in living room",
                            "Extra tv outside the shop"])

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